Preparation of twelve 1-methyl-2-formyl-5-substituted pyrroles (2a-1), with five of them as new compounds, is described. Their derivatives, i.e., 1-methyl-2-fo
Tris-, di-(organotitanium) substituted tungstosilicates α、β-[(CpTi)3(SiW9O37)]7- and γ-[(Cp-Ti)2(SiW10O38)]6- were prepared by the reaction of Cp2TiCl2 (Cp