{'fraction_non_alphanumeric': 0.029157667386609073, 'fraction_numerical': 0.016198704103671708, 'mean_word_length': 5.18, 'pattern_counts': {'":': 0, '<': 1, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Oxidation of 6- and 8-methylquinolines upon UV-illumination in the presence of a powder of TiO2 photocatalyst.

Selective transformation of the methyl group into a formyl group in methylquinolines is of great interest because formation of the corresponding aldehydes is either very expensive or unknown. We report here results concerning the photo-oxidation of 6- and 8-methylquinolines (6-MQ and 8-MQ) suspended with TiO2 powder in oxygenated acetonitrile. The analytical study of the products generated from the TiO2-photoassisted oxidation of 6-MQ and 8-MQ in oxygenated acetonitrile suspensions indicated that in both cases, for a UV-illumination period of < 24 h, the corresponding formyl derivatives quinoline-6- and -8-carbaldehydes are detected as practically the sole products. Analysis of further photogenerated oxidation products enabled mechanistic delineation of the course of the semiconductor-mediated reaction.