Try a strongly acidic,
reactive diazotizing agent in your R& D work· Ο II
HO-S-0-N = 0 Tiy DuPont nitrosylsulfuric acid. Whether you're developing or i m p r o v i n g products, D u Pont nitro sylsulfuric acid (MSA) is a useful reagent for diazotizing amines with out evolving nitrous acid fumes. NSA is a convenient, storage-stable, ready-to-use source of nitrosonium ion (MO + ). Consider it in your R & D work.
Use your imagination. You can use NSA stoichiometrically to reduce pollution problems that result f r o m nitrous acid fumes. You can have greater selection of concentration because there is no s o d i u m nitrite salt build-up problem. You can add it directly to diazotization batches and interrupt the re action without losing the batch. In fact, its the preferred diazotizing agent for weakly basic amines like negatively substituted anilines and aminoanthraquinones. You can evaluate it as a nitrosating agent in select reactions.
Apply for a sample. Currently used in m a k i n g dyes, drugs and c h e m i c a l intermediates, D u Pont MSA is supplied as a 4 0 percent solution in 87 percent sul furic acid (on an MSA-free basis), ready to use and stable at r o o m temperature. To get safety a n d handling infor m a t i o n and apply for a sample of D u Pont MSA, write o n your c o m pany letterhead to Dr. B. C. Lawes, D u Pont Company, R o o m X80011, W i l m i n g t o n , D E 19898.
·*&
us P » T » T M
o"
