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Finally, the phosphorus content of the distillate that remained at the end of a series conducted with identical catalyst was determined and the results provided in Table 2: 

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The procedure was as in Example 1, except that the catalysts used were salts with tris(dimethylamino)-N-[tris ( dimethylamino )-lambdas -phosphanylidene ]-lambdas - phosphaniminium cation, Me$_{12}$P$_{2}$N$_{7}$ +), each as about 10% solutions in isopropanol (3a: fluoride, 3b: difluoride, 3c: trifluoride, 3d: acetate, 3e: pivalate). The results can be found in Table 3. In none of the distillates was the phos- phorus content above the detection limit (about 1 ppm). 

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## Examples 2a to 2e 

## Inventive 

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The procedure was as in Example 1, except that the catalysts used were a) N"’-[P,P-bis(dimethylamino)-N-eth- y lphosphorimidoyl ]- N,N,N,N,N" ,N"-hexamethy lphospho- rimidic triamide as an about 10% solution in diethylene glycol di-n-butyl ether and the following more specific acid adducts thereof: b) fluoride (HF adduct onto neutral base), c): difluoride (adduct of 2 equivalents of HF onto neutral 

## Examples 3a to 3g 

## Inventive 

