3.8- Dinitro-4,6,7-trimethyl

The spiroindolinobenzopyran 2 is a classical example of spiropyran and is easily prepared by the condensation of l,3,3-trimethyl-2-methyleneindo-line (Fischer s base) and salicylaldehyde in anhydrous ethanol or benzene (Scheme 2).ia The nucleophilic attack of Fischer s base on the carbonyl group (like an enamine) gives an aldol product, which undergoes ring closure followed by dehydration. This condensation is reversible therefore, an exchange of the salicylaldehyde component of spiropyran with a different salicylaldehyde is possible. For example, when a solution of spiropyran 2 (Scheme 2) was refluxed with 3,5-dinitro-substituted salicylaldehyde, the open form of 6,8-dinitro-BIPS was obtained.2... 

Ethanone, 1- [3-(l,l-dimethylethyl)-4-methoxy-5-nitrophenyl Benzaldehyde, 2 (l,l-dimethylethyl)-4-methoxy-5-nitro Benzene, 1,4-BIS- (1, l-dimethylethyl)-2 methoxy-5-nitro Benzene, 1-(1, l-dimethylethyl)-2, 5-dimethoxy-4-nitro Benzene, 1-(1, l-dimethylethyl)-2-methoxy-4 methyl-5-nitro Benzaldehyde, 5- (1, l-dimethylethyl)-2-methyl-3-nitro Benzaldehyde, 2- (1, l-dimethylethyl)-4,5,6-trimethyl-3-nitro Benzene, 5-(l, l-dimethylethyl)-2-methoxy-l, 3-dinitro Benzene, 1-(1, l-dimethylethyl)-4-methoxy-2-methyl 3-5-dinitro Benzene, 2-bromo-5- (1, l-dimethylethyl)-4-methoxy-l,... 

Benzene, (cHLORO-teri-BuTYL)-, 32, 90 2-chloro-1, 3-dinitro-, 32, 23 ETHYNYL-, 30, 72 HEXAMETHYL-, 35, 73 1,2,3-trimethyl-, 34, 56 Benzeneboronic ACID, 39, 4 Benzeneboronic anhydride 39, 3 Benzenediazonium chloride, 32, 84 Benzenesulfenyl chloride, 36, 101 Benzenesulfonyl chloride, 31, 83 9,10-o-Benzenoanthracene, 9,10-dihydro-, 39, 75 Benzhydrol, 33, 11 Benzhydryl chloride, 39, 74 Benzidine, 36, 21... 

Aminopseudocumenes or Amino-l,2,4-trimethyl benzenes,(CH,)sC6H2 NH2. Several isomers are known of vfiich the 5-ctminopseudocianene is the most important. Its mono- and dinitro- compds are known but they are not expl. Azido- and diazido- derivs were not found in Beil or CA through 1956... 

Benzaldehyd 2,6-Dinitro-3,4,5-trimethyl- E3, 240 (CH3 - CHO) Benzoesaure 3-Nitro- -methox-imid-Essigsaure-Anhydrid E5, 830 (Ar-CO-NH-OR +... 

Chromone 3,8-Dinitro-4.6,7-trimethyl- E16d, 289 (Cyclokon-densation/Nitrierung)... 

Dinitro-mesitylene (2,4-Dinitro-l, 3,5-trimethyl benzene). C9H10N2O4, mw 210.21,... 

MisceUaneous Reactions.—Details of the formation of nitrous oxide by photofragmentation of methyl nitrite have been reported.Photorearrangement is observed, however, on irradiation of the nitrites (183) derived from 6-methyl- and 4,4,6-trimethyl-cholest-5-en-3-ol to give the cyclic hydroxamic acids (184). There is ample precedent for these transformations, the likely pathway for which is outlined in Scheme 12. An alkoxyl radical (185) is also thought to be involved in the photochemicaUy induced conversion of O-nitrobenzoin (186) into benzaldehyde (187) and 2-phenylbenzo[b]furan (188). Reductive photoelimination of vicinal dinitro-groups takes place by... 

Dinitro-phenylthio)- 848 3-Ethylsulfonyl- 1733 3-(Fluoro-acetoxy)- 1870, 1933 3-Hydroximino- 1246 3-(2-Hydioxy-ethyl)-2,3,5-trimethyl- 853 5-Hydroxy-3-methoxy- 1957 5-(3-Hydroxy-l-octinyl)-3-[5-(2-methoxycarbonyl-... 

Phthalaldehydsaure Die erhaltene Phthalonsaure wird auf 150° in Gegenwart der gleichen Gewichtsmenge 4,N,N-Trimethyl-anilin erhitzt Ausbeute 0,28 g (38%) Schmp. (2,4-Dinitro-phenylhydrazon) 247-248°. 

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