Chapter 1 Isoxazoles (pages 1–416):
Chapter 2 Isoxazolines (Dihy Droisoxazoles) (pages 417–647):
Chapter three Isoxazolidines (Tetrahydroisoxazoles) (pages 649–778):
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Extra resources for Chemistry of Heterocyclic Compounds: Isoxazoles, Part 1, Volume 49
29 ................................................................................... 04 95/61 95/61 95/61 95/61 95/61 95/67 95/67 160I70 160I70 160I70 160170 160170 160I70 160I70 160pO 160I70 A conformational study of the three monophenylisoxazoles has been carried out by means of PMR spectroscopy in liquid-crystal solvent. 95’67~259’70 xaZO~eS259:70,205B’80,52D~8 1 only a strong withdrawing substituent on the phenyl, mainly at C,, as a NO, group causes a substantial downfield shift of H, and also of H, 259’70 as in p-nitrophenylisoxazole.
Noteworthy is the behavior of 5-isoxazolecarboxaldehyde in various solvents as found by UV ~ p e c t r o s c o p y . ~ ~ /In~ ~apolar . ' ~ ~ 'solvents ~~ such as cyclohexane, it shows only one absorption maximum (244nm), while in polar solvents the main absorption band is at shorter wavelengths (214nm), sometimes with a shoulder at about 245 nm. 31i64,145i67 Similarly, 5-isoxazolepolyenealdehydes show different absorptions depending on the likelihood of the solvent to form hemiacetals.
20). 73). 67) infl. 80). 77). 72). 26). 22). 8 M H2S04/MeCOOH 202/76 PYrmYl Me No, OMe 3,5-Dimethyl-4-(arylazo)isoxazoles89’72~80c’75 show two absorption maxima in the ranges 226-240 nm and 330-348 nm in ethanolic solution, while 3,5-diphenyl-4-arylazoisoxazoles258~79 show one only at 343-372 nm. 119’78 The UV spectra of some variously substituted 5-halogenoisoxazoles have been reported and the shift of the bands d i s c ~ s s e d . 12. 23). 12. 20). 90). 89), 267 sh 216 sh. 245 sh. 90). 72) 218 sh 241 sh.