Pyrrolyl Compounds of the Main-Group Elements. II. The Crystal and Molecular Structure of (n1-C4H4N)4Si and the Reaction of C4H4NLi with SiHCL3

摘要

In a previous paper, we discussed the syntheses, structures and reactivities of tris(pyrrolyl)phosphine and arsine. The present paper is concerned with pyrrolyl compounds of silicon. Interestingly, (C4H4N)4Si (1)3 and (C4H4N)3 SiH (2)4 were prepared over seventy years ago by the reaction of C4H4NK with SiCl4 and SiHCl3, respectively. However, compound 1 has been mentioned only once in the intervening years. We have investigated the reaction of C4H4NLi with SiCl4 and SiHCl3 and found that compound 1 is converted to compound 2 in the presence of C4H4NLi. A single-crystal X-ray diffracion study of 1 was undertaken to define the mode of bonding between silicon and the pyrrolyl ligands. Moreover, since the pyrrolyl ligand is potentially a two-fold rotor, considerable interest focussed on the stereochemistry of 1. (Author)