us  10,131,736 B2  10  9  TABLE 1  TABLE 3-continued  TABLE 2  TABLE 3  Cata! st  Reaction temperature  Example  amount  nn  $^{20 }$on  addi- CC.  no.  cation  anion  [g]  lion of stopper  start  max.  TOF  la- A  n-Bu$_{4}$P  ow  13.1  1.4603  60  63  0.21  la- B  n-Bu$_{4}$P  10.8  1.4605  60  62  0.76  la- C  n-Bu$_{4}$P  ow  27.6  1.4617  80  83  0.31  la- D  n-Bu$_{4}$P  26.5  1.4609  80  84  0.70  la- E  n-Bu$_{4}$P  ow  61.9  1.4611  100  103  0.12  la- F  n-Bu$_{4}$P  46.7  1.4610  100  102  0.25  lb- A  n-Bu$_{4}$P  [HFX  0.4  1.4601  60  62  1.3  lb- B  n-Bu$_{4}$P  [HFX  0.3  1.4600  60  63  1.3  lb- C  n-Bu$_{4}$P  [HFX  0.5  1.4600  80  84  0.5  lb- D  n-Bu$_{4}$P  [HF 2 r  1.1  1.4600  100  105  0.2  lb- E  n-Bu$_{4}$P  [HFX  3.9  1.4602  120  127  0.1  lb- F  n-Bu$_{4}$P  [HFX  11.9  1.4602  140  152  0.1  le- A  n-Bu$_{4}$P  CH3Coo- 6.0  1.4610  60  62  0.05  le- B  n-Bu$_{4}$P  CH3Coo- 4.7  1.4606  60  62  0.05  le- C  n-Bu$_{4}$P  CH3Coo- 8.1  1.4605  80  82  0.04  le- D  n-Bu$_{4}$P  CH3Coo- 9.0  1.4608  80  82  0.04  le- E  n-Bu$_{4}$P  CH3Coo- 15.3  1.4609  100  102  0.02  le- F  n-Bu$_{4}$P  CH3Coo- 15.3  1.4612  100  101  0.02  ld- A  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  5.1  1.4600  60  63  0.05  ld- B  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  6.8  1.4609  60  61  0.04  ld- C  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  20.9  1.4608  80  81  0.01  ld- D  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  13.4  1.4609  80  81  0.03  ld- E  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  16.6  1.4607  100  100  0.02  ld- F  n-Bu$_{4}$P  (CH 3 ) 3 CCOO  16.4  1.4604  100  101  0.02  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:  Examples 2a to 2e  Inventive  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).  Reaction  Example  Catalyst  tem12erature  [°  C.]  no.  anion  amount [g]  start  max.  TOF  2a- A  F- 1.5  60  65  8.9  2a- B  F- 1.4  60  68  10.5  2a- C  F- 1.0  80  86  7.5  2a- D  F- 0.9  80  85  8.2  2a- E  F- 0.8  100  110  5.6  Examples 3a to 3g  Inventive  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  Reaction  Example  Catalyst  tem12erature  [°  C.]  no.  anion  amount [g]  start  max.  TOF  2a- F  F- 0.7  100  109  7.5  2b- A  [HFX  2.4  60  65  2.0  2b- B  [HFX  2.2  60  65  2.4  2b- C  [HFX  2.2  80  89  3.1  2b- D  [HFX  2.1  80  85  3.5  2b- E  [HFX  2.0  100  109  3.5  2b- F  [HFX  1.9  100  105  4.2  2c- A  [H2F3r  3.5  60  63  2.0  2c- B  [H2F3r  3.2  60  63  2.5  2c- C  [H2F3r  2.9  80  82  2.0  2c- D  [H2F3r  2.8  80  82  2.1  2c- E  [H2F3r  2.7  100  105  2.5  2c- F  [H2F3r  2.6  100  105  2.8  2d- A  CH3Coo- 2.5  60  62  2.2  2d- B  CH3Coo- 2.2  60  61  2.4  2d- C  CH3Coo- 2.2  80  83  2.9  2d- D  CH3Coo- 2.1  80  83  3.5  2d- E  CH3Coo- 1.9  100  106  3.9  2d- F  CH3Coo- 1.8  100  106  4.0  2e- A  (CH 3 hCCOO  3.6  60  66  3.4  2e- B  (CH 3 hCCOO  3.5  60  66  4.2  2e- C  (CH 3 hCCOO  3.1  80  82  5.2  2e- D  (CH 3 hCCOO  2.9  80  81  5.6  2e- E  (CH3hCco- 2.8  100  101  5.9  2e- F  (CH 3 hCCOO  2.8  100  101  6.5  Example  Catalyst  no.  cation  anion  P content of the distillate [ppm]  la- F  n-Bu$_{4}$P  OH- 73  lb- F  n-Bu$_{4}$P  [HF 2 r  730  le- F  n-Bu$_{4}$P  CH3Coo- 970  ld- F  n-Bu$_{4}$P  (CH3) 3 CCOO  1200 