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A mixture of 56.9 grams (200 mmol.) of tetra-n-butylurea, 32.2 grams (210 mmol.) of phosphorus oxychloride and 75 ml. of acetonitrile was heated at 75° C. in a nitrogen atmosphere for one hour. The mixture was then cooled to 0° C. and 33.6 grams (460 mmol.) of n-butylamine was added over 15 minutes with stirring, whereupon a soft, fluffy precipitate formed. The mixture was warmed to 60° C. for one hour and again cooled to 0° C., quenched with 50 ml. of 25% (by weight) aqueous sodium hydroxide solution and extracted with ether. The ether extracts were dried over magnesium sulfate, filtered and stripped to give a pale yellow oil which, upon distillation, yielded 56.32 grams (83% of theoretical) of penta-n-butylguanidine.

1. customwhereupon a soft, fluffy precipitate formed
2. temperatureThe mixture was warmed to 60° C. for one hour
3. temperatureagain cooled to 0° C.
4. customquenched with 50 ml
5. extractionof 25% (by weight) aqueous sodium hydroxide solution and extracted with ether
6. dry with materialThe ether extracts were dried over magnesium sulfate
7. filtrationfiltered
8. customto give a pale yellow oil which
9. distillationupon distillation