Benzaldehyde crystal structure

Benzotellurazole, 2-methyl-, condensation with benzaldehydes, 58, 59 Benzotellurazole, 2-phenyl-crystal structure, 58, 59 Pd(ll) and Hg(Il) complexes, 58, 56 substitution of Te by S, 58, 57 Benzotellurazolium salts, 1- and 3-methyl-2-phenyl-, 58, 56... 

Denmark and co-workers disclosed that the crystal structure of the 4-/ /t-butyl-benzaldehyde (ll)-SnCl4 complex shows a 2 1 stoichiometry with two nonequivalent aromatic aldehyde cis to one another around the octahedrally coordinated tin atom (Fig. 1-4) and further carried out variable-temperature NMR experiments with this complex [17]. 

In all cases except (2) the nitrogen is part of an imide system which forms a chelate complex after deprotonation to the enolate. We used a different approach by using the N,O-acetals 35/36. This was first performed in racemic form to test the diastereose-lectivity of the enolate alkylation (Scheme 8). The diastereomers 35 and 36 are readily separable by chromatography. Analogously, amides 35a and 36a are prepared from O-jV-Boc-amino benzaldehyde. Derivative 36a is crystalline and was submitted to an X-ray crystal structure analysis (Fig. 1). 

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