The North Jersey ACS NMR Topical Group is pleased to present its March meeting online, Thurs, March 23, 12:00 noon ET, via Microsoft Teams.

Featured Presentation

Seminar details:

Date: Thursday March 23 at 12:00 noon ET

Xiao WangSpeaker: Xiao Wang
Merck [ ]

Title: “Unequivocal Identification of Two-bond Heteronuclear Correlations by i-HMBC to Facilitate the Elucidation of Complex Natural Product Structures at Nanomole Scale “

Flyer: [ NJACS-flyer-Xiao Wang-Mar2023_v1.pdf ]

HMBC is an essential NMR experiment for determining multiple bond heteronuclear correlations in small to medium-sized organic molecules, including natural products, yet its major limitation is the inability to differentiate two-bond from longer-range correlations. There have been several attempts to address this issue, but all reported approaches suffer various drawbacks, such as restricted utility and poor sensitivity. Here we present a sensitive and universal methodology to identify two-bond HMBC correlations using isotope shifts, referred to as i-HMBC (isotope shift detection HMBC). Experimental utility was demonstrated at the sub-milligram / nanomole scale with only a few hours of acquisition time required for structure elucidation of several complex proton-deficient natural products, which could not be fully elucidated by conventional 2D NMR experiments. Because i-HMBC overcomes the key limitation of HMBC without significant reduction in sensitivity or performance, i-HMBC can be used as a complement to HMBC when unambiguous identifications of two-bond correlations are needed. 

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Jonathan.OsbornPopp (Chair) (Co-Chair)

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