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- W2009519690 abstract "Abstract Attempts to substantially increase the relative proportion of β-lactose octaacetate in products of acetylation of α-lactose monohydrate using various acetylation protocols failed. Nevertheless, the revised protocol for isolation and crystallization, based on the classical work by Hudson and Johnson, rendered preparation of β-lactose octaacetate less labor intensive. It is proposed that the melting point and [α]D value are not reliable criteria of purity of β-lactose octaacetate, which can be confidently determined by 1H NMR spectroscopy. Keywords: 1,2,3,6,2′,3′,4′,6′-Octa-O-acetyl-β-lactose2,3,4,6-Tetra-O-acetyl-β-d-galac- topyranosyl-(1→4)-12,3,6-tetra-O-acetyl-β-d-glucopyranose2,3,4,6-Tetra-O-acetyl-β- d-galactopyranosyl-(1→4)-12,6-tri-O-acetyl-α,β-d-glucopyranose2,3,4,6-Tetra-O-ace- tyl-β-d-galactopyranosyl-(1→4)-12,6-tri-O-acetyl-β-d-glucopyranose; Crystallization ACKNOWLEDGMENT This research was supported by the Intramural Research Program of the NIH, NIDDK. This article not subject to US copyright law. Notes The term lactose is a trivial name reserved[ Citation 1 ] for β-D-galactopyranosyl-(1→4)-α,β-D-glucopyranose (or 4-O-β-D-galactopyranosyl-α,β-D-glucopyranose). The terms D-lactose or D-lactopyranose, which can often be found in print, are notoriously incorrect. The “D” is redundant because of the definition, and “…pyran…” is obvious because of the (1→4)-linkage involved in the structure and, therefore, unnecessary. Sigma-Aldrich has discontinued offering the compound (>98% purity), and the current price by the sole supplier in the United States, 3B Scientific Corporation (www.3bsc.com), is $980/100 g. Toronto Research Chemical, Inc. lists the compound at $1000/100 g, but the anomeric purity of the material is uncertain." @default.
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- W2009519690 date "2012-11-01" @default.
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- W2009519690 title "Observations on the Preparation of β-Lactose Octaacetate" @default.
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- W2009519690 doi "https://doi.org/10.1080/07328303.2012.739230" @default.
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