STIMULATED RAMAN EFFECT - A NEW SOURCE OF LASER TEMPERATURE-JUMP HEATING
STIMULATED RAMAN EFFECT - A NEW SOURCE OF LASER TEMPERATURE-JUMP HEATING
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DOI：
10.1021/ja00716a063
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发表时间：
1970-01-01
影响因子：
15
通讯作者：
SUTIN, N
中科院分区：
文献类型：
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作者：
BEITZ, JV;FLYNN, GW;SUTIN, N
7.5 Hz，图2）。不能从1或2的光谱中进行测定，因为在这些化合物中，由于H-2 '和H-3'的化学位移接近，H1 '实际上也与H-3'偶联（图1）。类似地，对1的220-MHz NMR光谱21的分析揭示了4-O-乙酰基-L-阿卡糖的糖苷键（J1 = 4.5Hz，J2 = 1Hz）。这些分配证实了以前的分子旋转差异的测定。[22]考虑到各种大环内酯类抗生素的共同生物合成来源，提出的结构并不意外。23，24将结构1归属于兰卡霉素消除了糖取代模式中的唯一差异。所有描述的14元苷元环大环内酯类抗生素，赤霉素-
7.5 Hz, Figure 2). The determination could not be made from the spectra of 1 or 2 since in these compounds Hl'is also virtually coupled20 to H-3'due to the chemical shift proximity of H-2'and H-3'(Figure 1). Similarly, analysis of the 220-MHz nmr spectra21 of 1 revealed an-glycosidic linkage for 4-O-acetyl-L-arcanose (Ji", ia»= 4.5 Hz, Jvw='~ 1 Hz). These assignments corroborate previous molecular rotational difference determinations. 22 The proposed structure is not unexpected in view of the suggested common biosynthetic origin of the various macrolide antibiotics. 23, 24 The assignment of structure 1 to lankamycin removes the only discrepancy in the pattern of sugar substitution. All described 14-membered aglycone ring macrolide antibiotics, eryth-