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A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atoms in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20° C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. T

A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atoms in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20° C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. The polyhydridosilane can be derivatized or it can be converted to a pyropolymer or a nitrogen-containing pyropolymer which is useful as an abrasive, ceramic, electrical, or electro-optical material.

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1. A polyhydridosilane having a catenated silicon backbone having an average of 20 to 4000 silicon atoms with a number of hydride atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of said polyhydridosilane being soluble at 20° C. in 100 grams of at least one of the organic solvent

1. A polyhydridosilane having a catenated silicon backbone having an average of 20 to 4000 silicon atoms with a number of hydride atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of said polyhydridosilane being soluble at 20° C. in 100 grams of at least one of the organic solvents selected from the group consisting of tetrahydrofuran, toluene, and methylene chloride, said polyhydridosilane being tractable and moisture-sensitive. 2. An organic solvent-soluble polymer having a backbone consisting essentially of repeating monomeric units having the formula ##STR## where R is the same or different and is independently selected from the group consisting of (1) hydrogen, (2) a linear, branched, or cyclic aliphatic group having 1 to 10 carbon atoms and optionally containing at least one Periodic Group VA or VIA atom, (3) an aromatic group which is unsubstituted or substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aromatic or aliphatic groups optionally containing at least one Periodic Group VA or VIA atom, the total number of carbon atoms being up to 25, (4) a single bond connecting two silicon atoms, (5) a metal atom selected from the group consisting of Periodic Groups IA and IIA, and (6) an inorgano- and organometallic group comprising at least one Periodic Group IB to VIIB, VIII, Lanthanide or Actinide element, with the proviso that the ratio of hydride to silicon is in the range of 0.3 to 2.2; the average number of monomeric units of said formula in the polymer is in the range of 20 to 4,000, and said polymer being tractable and moisture-sensitive. 3. The polymer according to claim 2 wherein said monomeric units are randomly arranged. 4. The polymer according to claim 2 wherein each R is independently selected from hydrogen, methyl, ethyl, phenyl, and a single bond connecting two silicon atoms. 5. The polymer according to claim 2 having an average number in the range of 12 to 4000 units of the formula --SiH 0 .3-2.2). 6. The polymer according to claim 2 which is selected from a random copolymer of (a) a dialiphaticsilane and a dihydridosilane, and a random copolymer of (b) an aliphatichydridosilane and an aromatichydridosilane. 7. The polymer according to claim 2 selected from polymers comprising at least one monomeric unit selected from units having the formulae --SiH 2 ), --CH 3 SiH), --C 6 H 5 SiH), and --C 2 H 5 SiH). 8. The polymer according to claim 2 wherein R is selected from the group consisting of hydrogen, alkyl, alkoxy, alkylamino, aryl, arylamino, and a single bond connecting two silicon atoms, and combinations thereof. 9. The polymer according to claim 2 wherein each R is independently selected from the group consisting of hydrogen, methyl, ethyl, n-butyl, methoxy, benzyl, benzylmethylamino, phenethyl, and a single bond connecting two silicon atoms. 10. An organic solvent-soluble polymer having a backbone consisting essentially of repeating monomeric units having the formula ##STR## where R is the same or different and is independently selected from the group consisting of (1) hydrogen, (2) a linear, branched, or cyclic aliphatic group having 1 to 10 carbon atoms and optinally containing at least one Periodic Group VA or VIA atom, (3) an aromatic group which is unsubstituted or substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aromatic or aliphatic groups optionally containing at least one Periodic Group VA or VIA atom, the total number of carbon atoms being up to 25, (4) a single bond connecting two silicon atoms, (5) a metal atom selected from the group consisting of Periodic Groups IA and IIA, and (6) an inorgano- or organometallic group comprising at least one Periodic Group IB to VIIB, VIII, Lanthanide or Actinide element, with the proviso that the ratio of hydride to silicon is in the range of 0.3 to 2.2; the average number of monomeric units of said formula in the polymer is in the range of 9 to 4,000, and said polymer being tractable and moisture-sensitive, said polymer further comprising at least one group selected from ##STR## wherein R 1 is selected from the group consisting of (1) hydrogen, (2) a linear, branched or cyclic aliphatic group having 1 to 10 carbon atoms and optionally containing at least one catenary oxygen atom, (3) an aromatic group optionally substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aliphatic and aromatic groups optionally containing at least one catenary oxygen atom, the total number of carbon atoms being up to 25, and (4) a single bond connecting two silicon atoms; and M is a Periodic Group IA or IIA metal. 11. The polymer according to claim 10 wherein M is selected from the group consisting of sodium and lithium. 12. The polymer according to claim 2 which has been substantially crosslinked. 13. A method of preparing a polyhydridosilane having an average of 9 to 4000 silicon atoms and having a hydride to silicon ratio in the range of 0.3 to 2.2 comprising the steps of: a. providing at least one hydridosilane having the formula (R 1 ) 2 SiX 2, wherein R 1 is selected from the group consisting of (1) hydrogen, (2) a linear, branched, or cyclic aliphatic group having 1 to 10 carbon atoms and optionally containing at least one catenary oxygen atom, (3) an aromatic group optionally substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aliphatic and aromatic groups optionally containing at least one catenary oxygen atom, the total number of carbon atoms being up to 25, and (4) a single bond connecting two silicon atoms; X is a halogen atom, and b. reacting said at least one hydridosilane in the presence of a catalytically effective amount of naphthalene or other polynuclear aromatic compound with a Periodic Group IA or Group IIA metal or alloy in an amount of at least 1 equivalent of metal per equivalent of halogen in an inert atmosphere and in an inert diluent for a time sufficient to provide a polyhydridosilane, at least 0.1 gram of said polyhydridosilane being soluble in 100 grams of organic solvent at 20° C. 14. The method according to claim 13 wherein said polyhydridosilane comprises repeating monomeric units having the formula: ##STR## wherein R 1 is as defined in claim 13; and wherein the ratio of hydride to silicon is in the range of 0.3 to 2.2; and the average number of monomeric units in the polymer is in the range of 9 to 4000. 15. The method according to claim 13 further comprising the step of reacting said resulting polyhydridosilane with a sufficient quantity of a Periodic Group IA or IIA metal to provide a silyl derivative of a Group IA or IIA metal having the formula ##STR## wherein R 1 is as defined in claim 13, and M is a Periodic Group IA or IIA metal. 16. The method according to claim 13 further comprising the step reacting said polyhydridosilane with a reagent selected from alcohols, amines, alkenes, aromatic or aliphatic halides having the formulas ROH, R 2 NH, R 2 C=CR 2, respectively and inorgano or organometallic compounds R 2 M, wherein R is the same or different and is independently selected form the group consisting of (1) hydrogen, (2) a linear, branched or cyclic aliphatic group having 1 to 10 carbon atoms and optionally containing at least one Periodic Group VA or VIA atom, (3) an aromatic group which is unsubstituted or substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aromatic or aliphatic groups optionally containing at least one Periodic Group VA or VIA atom, the total number of carbon atoms being up to 25, and (4) a single bond connecting two silicon atoms, and R 2 is defined the same as R, and M is a Group IA or IIA metal. 17. The method according to claim 15 further comprising the steps of: a. treating said silyl derivative of a Group IA or IIA metal with a compound selected from the group consisting of aliphatic or aromatic halide R 3 CX, transition metal halide TX n L m and CuCl, wherein R is the same or different and is independently selected from the group consisting of (1) hydrogen, (2) a linear, branched, or cyclic aliphatic group having 1 to 10 carbon atoms and optionally containing at least one Periodic Group VA or VIA atom, (3) an aromatic group which is unsubstituted or substituted by up to three C 1 to C 10 linear, branched, or cyclic aliphatic groups, said aromatic or aliphatic groups optionally containing at least one Periodic Group VA or VIA atom, the total number of carbon atoms being up to 25, and (4) a single bond connecting two silicon atoms, T is selected from one or more of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, or Actinide or Lanthanide metal, M is a Periodic Group IA or IIA metal, L is independently selected from one or more of the following groups: (1) an aliphatic or aromatic group containing one or more carbon-to-carbon multiple bonds; (2) a group containing one or more Periodic Group VA atoms optionally substituted with up to 4 groups independently selected from aliphatic and aromatic groups and hydrogen atoms; or the Group VA atom or atoms may be part of an aromatic group, or the Group VA atom may be multiply bonded to carbon and optionally substituted with at least one aliphatic or aromatic group, (3) a group containing one or more Group VIA atoms optionally substituted by up to 5 groups independently selected from aliphatic and aromatic groups, or a hydrogen atom, or, the Group VIA atom(s) may be multiply bonded to carbon and optionally substituted with at least one aliphatic or aromatic group; (4) R 1 is as defined above; (5) CO; and wherein M is selected depending on L so as to achieve a stable compound, X is a halogen atom, n is an integer from 1 to 5, and m is an integer from 1 to 6. 18. A polyhydridosilane having a catenated silicon backbone having an average of 20 to 4000 silicon atoms with a number of hydride per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of said polyhydridosilane being soluble at 20° C. in 100 grams of at least one of the organic solvents selected from the group consisting of tetrahydrofuran, toluene, and methylene chloride, said polyhydridosilane being tractable and moisture-sensitive. 19. The polymer according to claim 10 wherein the average number of monomeric units of said formula ##STR## is in the range of 20 to 4000.