Preparation of Pyrimidines from Cyanic Esters and CH-Acidic Compounds

✍ Scribed by Dr. E. Grigat; Dr. R. Pütter

• Publisher: John Wiley and Sons
• Year: 1965
• Tongue: English
• Weight: 233 KB
• Volume: 4
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196508772

✦ Synopsis

bivalent mercury containing the grouping Si-0-Hg. We found, however, that compounds of this type are readily accessible by treatment of mganomercury halides with alkali silanolates in tetrahydrofuran (1 h a t 65 "C):

Compound (1) forms colorless, sublimable crystals [2], m.p. 52 OC, is very soluble in organic solvents, and is monomeric in benzene, in contrast to the results for (CH3)3Si-O-ZnCH3 and (CH3)3Si-O-CdCH3 for which a four-fold molecular weight has been found. The acceptor strength of mercury is clearly less than that of zinc or cadmium. Dimethyl(trimethylsiloxy)thallium, the first heterosiloxane with a Si-0-TI group, has been prepared analogousIy from (CH3)3SiONa and dimethylthallium chloride:

This compound forms colorless, sublimable crystals (2), m.p. 98-100 "C, that dissolve in organic solvents where they are dimeric. In this respect they resemble the analogous heterosiloxanes of aluminium, gallium, and indium [3-51.

(2)