Benz-oxazoles and -thiazoles have been prepared, benz-isoxazoles are known as indoxazenes; benzo-pyrazoles occur in two structural forms, named indazoles and isindazoles.
Benzaldoximes.-The a-oxime (benz-anti-aldoxime) is formed by the action of hydroxylamine on benzaldehyde.
Acids convert it into the O-oxime (benz-syn-aldoxime) which melts at 125° C. When distilled under diminished pressure the 0-form reverts to the a-modification (see Beckmann, Ber., 1887, 20, p. 2766; 1889, 22, pp. 4 2 9, 5 1 3, 1531, 1588).
The former (known as the a or benz-anti-aldoxime) melts at 34-35° C.; the latter (0 or benz-syn-aldoxime) melts at 130° C. and is slowly transformed into the a form.
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