Highly efficient green synthesis of the photochromic spironaphthoxazines using an eco-friendly choline hydroxide catalyst
作者:Shailesh N. Vajekar、Ganapati S. Shankarling
DOI:10.1080/00397911.2019.1694690
日期:2020.2.1
Abstract A greener route for the synthesis of the photochromic spironaphthoxazines employing a highlyefficient, biodegradable and recyclable choline hydroxide catalyst in an aqueous medium has been described. This methodology offers diverse advantages such as mild reaction conditions, short reaction time (1 h), excellent yields (up to 91%), and operational simplicity that make it a useful and attractive
Direct Nitration Reactions of Photochromic Spirooxazines
作者:N. L. Zaichenko、A. I. Shiyonok、L. S. Kol'tsova、V. S. Marevtsev
DOI:10.1080/15421400590946875
日期:2005.6.1
A direct nitration of photochromic spirooxazines was carried out by three different methods. The molecular structure of main products was determined by NMR H-1 and C-13 spectra. The nitration mechanisms were proposed. It was shown that only nitration by mixture of nitric and sulfuric acids gives photochromic compounds with nitrogroup in aryloxazine ring.
Synthesis and photochromic properties of spiro (benzindoline-naphthoxazines)
作者:V. Yu. Nedoshivin、N. L. Zaichenko、A. I. Shienok、V. S. Marevtsev
DOI:10.1007/bf00698509
日期:1995.4
A new photochromic compound belonging to the class of spiro(indoline-naphthoxazines) was synthesized. Nitration of this compound was carried out and the structures of two photochromic nitro-substituted products were determined. The photochromic properties of the products were studied in solvents of different polarity.