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It has been known for 50 years that separating these two effects, chemical shift and scalar coupling, into different spectral dimensions could greatly improve spectral resolution, and hence facilitate structure elucidation. Experimental implementations to date have failed because they cannot measure the spin behavior for negative times. We show here, for a wide range of samples, that the missing information can be reconstructed from the experimental evidence. This yields both cleanly resolved two\u2010dimensional spectra, and a highly effective way to obtain simple \u201cpure shift\u201d one\u2010dimensional proton spectra without homonuclear multiplet structure.<\/jats:p>","DOI":"10.1002\/cmtd.70172","type":"journal-article","created":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T03:21:20Z","timestamp":1792380080000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Proton NMR Revisited: Negative Time Reconstruction Transforms Pure Shift and 2D\n                    <i>J<\/i>\n                    \u2010Spectroscopy"],"prefix":"10.1002","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4859-6259","authenticated-orcid":false,"given":"Gareth A.","family":"Morris","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-9504-8623","authenticated-orcid":false,"given":"Ellie","family":"Davies","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8009-5334","authenticated-orcid":false,"given":"Ralph W.","family":"Adams","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3301-7899","authenticated-orcid":false,"given":"Mathias","family":"Nilsson","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soumya S.","family":"Roy","sequence":"additional","affiliation":[{"name":"Defence Science and Technology Laboratory (DSTL) Porton Down  Salisbury UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,18]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.431994"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1674608"},{"key":"e_1_2_9_4_1","volume-title":"High\u2010Resolution NMR Techniques in Organic Chemistry","author":"Claridge T. 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