The straightforward synthesis of polycarbosilanes (PCS) was achieved via the polycondensation of chlorosilanes and chloromethanes using magnesium (Mg) and titanium(IV) tetrachloride (TiCl₄). In this polycondensation, TiCl₄ acts as an efficient catalyst and the combined use of Mg and TiCl₄ is necessary to produce PCS. The resulting PCS are viscous colored oils that are soluble in organic solvents. The number-average molar mass (M_n; 1.0–1.5 kg mol⁻¹) and molar-mass dispersity (Ð_M; 1.3–1.9) values of the resulting PCS were determined by size-exclusion chromatography (SEC) using polystyrene standards. The ¹H, ¹³C{¹H}, and ²⁹Si{¹H} NMR as well as IR spectra of the resulting PCS revealed that they consist of Si–C, Si–H, Si(H)–H, C–C, and Si–Si bonds. The structures of the resulting PCS vary depending on the structures of the monomers and their initial molar ratios. The ceramic yields from the obtained PCS (23–70%) depend on the original structures of the PCS. A plausible mechanism of this polycondensation is proposed based on the results of polycondensations and model reactions.

聚碳硅烷 (PCS) 的直接合成是通过氯硅烷和氯甲烷使用镁 (Mg) 和四氯化钛 (IV) (TiCl ₄ )的缩聚反应实现的。在该缩聚反应中，TiCl ₄作为一种有效的催化剂，Mg 和 TiCl ₄的组合使用对于生产 PCS 是必要的。所得 PCS 是可溶于有机溶剂的粘性有色油。所得 PCS的数均摩尔质量 ( M _n ; 1.0-1.5 kg mol ^-1 ) 和摩尔质量分散度 ( Ð _M ; 1.3-1.9) 值通过使用聚苯乙烯标准的尺寸排阻色谱法 (SEC) 确定。的¹ H，¹³C{ ¹ H} 和²⁹ Si{ ¹ H} NMR 以及所得 PCS 的 IR 光谱表明它们由 Si–C、Si–H、Si(H)–H、C–C 和 Si–组成硅键。所得 PCS 的结构取决于单体的结构及其初始摩尔比。获得的 PCS 的陶瓷产率 (23-70%) 取决于 PCS 的原始结构。基于缩聚和模型反应的结果提出了这种缩聚的合理机制。