{'fraction_non_alphanumeric': 0.023391812865497075, 'fraction_numerical': 0.025146198830409357, 'mean_word_length': 5.313653136531365, 'pattern_counts': {'":': 0, '<': 0, '<?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}}
Corrigendum: Pyridylidene-Mediated Dihydrogen Activation Coupled with Catalytic Imine Reduction.

DOI: 10.1002/anie.201503233 Upon further studies of the imine reduction shown in Table 1, it was found that the control experiment in entry 5 could not be reproduced.[1] In contrast to the earlier result, which had shown no reaction, repetition of this experiment under carefully controlled conditions using freshly prepared LiHDMS solution revealed that imine 20 was reduced to the corresponding amine in a purely base-mediated process. This finding casts doubt on the mechanism postulated in Scheme 7 in the original publication, which involves hydride transfer from dihydropyridine 18 to imine 20. Additional studies, which included deuteration experiments,[1] demonstrated that two independent parallel reactions occur under the conditions listed in Table 1, namely a base-mediated reduction of pyridinium salt 16 via a pyridylidene intermediate (as formulated in Scheme 4) and a purely baseinduced hydrogenation of imine 20. On the other hand, no evidence for the postulated hydride transfer from dihydropyridine 18 to imine 20 could be obtained. Accordingly, the mechanistic conclusions concerning the observed imine reduction have to be revised as shown here in Scheme 7, which replaces the original Scheme. Although dihydropyridine 18 is a potential hydride donor, it does not act as a reducing agent under the conditions listed in Table 1. On the other hand, the unexpected finding that imine 20 reacts with H2 in a solely base-induced process opens up new ways towards transition-metal-free hydrogenation. The scope and mechanism of this base-mediated imine reduction are currently under investigation.