The long-range proton–proton coupling constants between the ring protons and the aldehydic proton are reported for a series of -substituted benzaldehyde derivatives. It was found that 0. Furthermore, increases in magnitude as the electron donating power of the sub-stituent increases. A similar ...
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It is shown that the splittings of the combination lines are equal if the aldehyde proton is coupled to the proton in position three only, and are different if there is another coupling present. In this way, the magnitudes and relative signs of the JOCH-3 and JOCH-4 or JOCH-6 are ...
The long-range proton–proton coupling constants between the ring protons and the aldehydic proton are reported for a series of para-substituted benzaldehyde derivatives. It was found that J o H,CHO <0 and J m H,CHO >0. Furthermore, J o H,CHO increases in magnitude as the electron ...
This coupling, formally over five bonds, correlates with the chemical shift of the hydroxyl proton. The coupling mechanism is discussed from various viewpoints. STO 3G MO calculations give an optimized planar structure for salicylaldehyde. Nonplanar structures are less stable than the planar form. ...
The spin–spin coupling constant between the aldehydic proton and the proton in the para position, JpH,HCO is negative in 2,6-dinitrobenzaldehyde. JpH,CHO is also very likely negative in 2,6-dichlorobenzaldehyde. It is suggested that steric interaction with the ortho substituents forces the ...