Polysilazanes and related compositions, processes and uses.

(57) The method of adjusting a silazane suitable as summary purpose pre ceramic polymer and シロキ Southern is acquired. Composition It is the method of preparing a silazane suitable as pre ceramic polymer, and シロキ Southern, and the following processes are included. (a) In a molecule structure-R'Si-A-. The line, the letter of branch, or the annular start substance which it has. The thing; for which a giving (A is hydrogen, and NR or Si here, and this start substance is oligomer, polymer, or コポリマー) ; (b) transition metal catalyst is given, and (c) this start substance under existence of such a catalyst, (1) Let me react to H-X-R whose A are hydrogen or a hydrogen donor and is NR, in which this start substance is hydrogen which is a part of silazane, a hydrogen donor, or (2) H-X-R and whose A is hydrogen or Si.