Carbosilane and polycarbosilane

A polycarbosilane represented by the following general formula (2) whose weight average molecular weight in terms of polystyrene is 800-100,000:

• 19
• wherein M represents an Sn, Ge or Pb atom;
• A represents an aliphatic group having 2-10 carbon atoms, a carbocyclic group or a heterocyclic group containing one or more atoms selected from silicon, oxygen, nitrogen and sulfur atoms, both groups having 6-30 carbon atoms;
• R1, R2, R3, R6, R7 and R8 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• R4, R5, R9 and R10 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, an alkenylalkyl or alkynylalkyl group having 3-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• and 1<n≦500.

A polycarbosilane represented by the following general formula (3) whose weight average molecular weight in terms of polystyrene is 800-100,000:

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• wherein, M represents an Sn, Ge, or Pb atom;
• A and A1 each independently represent an aliphatic group having 2-10 carbon atoms, a carbocyclic group or a heterocyclic group containing one or more atoms selected from silicon, oxygen, nitrogen and sulfur atoms, both groups having 6-30 carbon atoms;
• R1, R2, R3, R6, R7 and R8 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• R4, R5, R9, R10, R41, R51, R91 and R101 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, an alkenylalkyl or alkynylalkyl group having 3-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• and 1≦n≦499, 1≦n1≦499 and 2≦n+n1≦500, provided that the two structural units for carbosilane are not identical each other.

A process for producing a polycarbosilane represented by the general formula (2)

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• wherein M represents an Sn, Ge or Pb atom;
• A represents an aliphatic group having 2-10 carbon atoms, a carbocyclic group or a heterocyclic group containing one or more atoms selected from silicon, oxygen, nitrogen and sulfur atoms, both groups having 6-30 carbon atoms;
• R1, R2, R3, R6, R7 and R8 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• R4, R5, R9 and R10 each independently represent an alkyl group having 1-20 carbon atoms, an alkenyl or alkynyl group having 2-20 carbon atoms, an alkenylalkyl or alkynylalkyl group having 3-20 carbon atoms, or an aryl group having 6-20 carbon atoms;
• and 1<n≦500,
• or the general formula (3)
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• wherein M, A, R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are as defined above;
• A1 has the same meaning as A;
• R41, R51, R91 and R101have the same meaning as R4, R5, R9 and R10, respectively;
• and 1≦n≦499, 1≦n1≦499 and 2≦n+n1≦500, provided that the two structural units for carbosilane are not identical each other, which comprises reacting the same or different kinds of carbosilanes represented by the general formula (1)
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• wherein M, A, R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are as defined above, using an organic typical metal compound as an initiator.