New silylalkylborane compounds, useful for the production of ceramic powder, are prepared by reaction of a silane with a metal in an aprotic solvent followed by reaction with a borane compound

摘要

New silylalkylborane compounds are prepared by reaction of a silane with a metal at less than 50 [deg]C in an aprotic solvent to form a further silane which is then reacted with a borane at below 50 [deg]C. New silylalkylborane compounds of formula (1) are prepared by reaction of a silane of formula (2) with a metal, M, at less than 50 [deg]C in an aprotic solvent to form a silane of formula (3) which is then reacted with a borane of formula (4) at below 50 [deg]C. (R) 3Si-C(R 1)(R 2)-B(R) 2 (1) (R 3)Si-C(R 1)(R 2)-X (2) (R) 3Si-C(R 1)(R 2)-M(X) w (3) Y-B(R) 2 (4) R : 1-20C hydrocarbon, H, halogen, NR'R'' or OR'; R', R'' : H or 1-20C hydrocarbon; R 1, R 2H, halogen, 1-20C hydrocarbon, NR'R'' or OR'; X : halogen; M : metal; Y : halogen, NR'R'' or OR' Independent claims are also included for the following: (i) a process for the production of a compound of formula (5) by reaction of a compound of formula (6) with elemental halogen or an organic acid halide; (ii) a silylalkylborazine of formula (7) prepared by reaction of a silylalkylborane of formula (1) with an amine N(R 4) 3 or ammonium salt HN(R 4) 3 +; (iii) oligo or polycarbosilazanes, prepared from a compound of formula (1) or a compound of formula (7), having a structural unit of formula (8); (iv) a silicon-boron-carbonitride ceramic having N-Si-C-B-N structural units prepared by pyrolysis of an oligo- or polyborocarbosilazane or silylalkylborazine of formula (7) in an inert or ammonia-containing atmosphere at -200 to +2000 [deg]C followed by calcining in an inert or ammonia-containing atmosphere at 800-2000 [deg]C; (v) a composite ceramic containing dispersed SiC, Si 3N 4, BN, C and/or B 4C prepared by heating a siliconboroncarbonitride ceramic at above 1400 [deg]C. (R) 3Si-C(R 1)(R 2)-B(X) 2 (5) (R) 3Si-C(R 1)(R 2)-B(OR')(OR'') (6) [Image] R 3H, halogen, N(R')(R'') or OR'; R 4R', Sn(R *) 3 or Si(R *) 3; R *R 2 or 1-20C hydrocarbon. [Image].