Diorganotin Dihalides Containing Carbonyl Groups

3 DIORGANOTIN DIHALIDES CONTAINING CARBONYL GROUPS All compounds are listed in Table l46 on page 526. 

IR spectrum, IR spectrum, IR spectrum, IR spectrum, IR spectrum, IR spectrum, IR spectr im, IR spectrum, IR spectrum, IR spectrum, IR spectrum, (a) 

Numbers in parenthesis refer to pages in main volume. 

The characters used here correspond to the synthetic scheme in the introduction to Chapter. 1.2. 

The majority of the iodides and bromides in this chapter is synthesized by reaction of metallic tin with the corresponding halides of the carboxylic acid esters or amides at 120 to I70 in presence of catalytical amounts of magnesium alkyl iodides and polar solvents. The chlorides and some bromides issue from interconversion reactions of the heavier halides via oxides or hydroxides which are usually not isolated. Yields for the heavy halides prepared by the direct synthesis with metallic tin vary from below 20 to 70% and are greatly enhanced by the above mentioned catalysts. Structure as octahedral coordina tion compounds under inclusion of the carbonyl group but not the amide group is stated and spectroscopic evidence for this structure is forewarded. The compounds compiled in Table 1 7 are prepared by the following methods. 

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