Condensation subst

N)3C6H2.N(N02).CH2.CH2.N(N02).C6H2(N02)3 mw 572.28, N 24.48%, OB to C02 -44.7% It yel fine crysts(from acet or nitrobenz), mp 218-22° (dec) for the pure and 206-7° for tech subst sol in nitrobenz si sol in acet or et acet insol in w, ale, eth, benz, etc. Several methods for its prepn exist but most of them give impure products. For prepn of the pure compd, Schouten(Ref 3,p 546) recommends nitration of l,2-bis(2, 4 -dinitro-anilino)-ethane or l,2-bis(2 ,4,6 -trinitroanilino) -ethane with abs nitric acid. More economical seems to be the method mentioned in Blatt(Ref 10, under N,N -Dipicrylethylenedinitramine), which involves condensation of ethylenediamine with picryl chloride(yield 89%), followed by nitration of the resulting product with 99% nitric acid at 25°(90% yield)... 

Subst., unsatd. succinic acid monoesters Stobbe condensation... 

Bis(pentafluorophenyl) sulfite added to a soln. of N-r rFbutyloxycarbonylglycine in DMF containing 1 eq. pyridine, and stirred for 0.1-1 h at 20° - product. Y 96% (70% from pentafluorophenol with DCCI as condensing agent). There was no racemization with a-subst. derivs. F.e.s. A.V. Hina et al., Izv. Akad. Nauk SSSR Ser. Khim. 1988, 2816-8 with methyl pentafluorophenyl carbonate cf. Izv. Akad. Nauk LatvSSR Ser. Khim. 1988, 624. 

N-Subst. a-aminocapboxylic acids fpom nitpo compounds and alcohols Redoxidative condensation... 

Subst. 1-acylguanidines from aldehydes Redox-condensation... 

Subst. adenines—4-Aminopteridines s. 74, 473 Condensed heterocyclics from cyclic a-diketones... 

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