The use of isotopes of carbon such as C13 and C14 for biological studies is limited by the present availability of relatively small quantities of isotope. Another difficulty arises from the fact that the synthesis of organic compounds labelled with isotopic carbon may frequently involve condensations which give low yields. In order to conserve isotope we have devised new or modified synthetic methods for the preparation of such compounds on a small ...
![[1-13C]acetic acid methyl ester结构式](https://image.chemsrc.com/caspic/448/1520-58-7.png)
