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1) difluoruros de alquil (metil, etil, n-propil o isopropil) fosfonilo, tales como: df: difluoruro de metilfosfonilo (cas 676-99-3);
1. alkyl(methyl-, ethyl-, n-propyl- oder isopropyl-)phosphonsäuredifluoride wie: df: methyl-phosphonsäuredifluorid (cas-nr. 676-99-3),