Sometimes published as special articles in primary journals, or conference proceedings. Most are in serial or journal works whose titles can clue you in like "Reviews in" or "Progress in"
A few examples listed below from the Duke collections:
See also review issues of some journals such as:
When searching databases for review articles, you can limit your search only to reviews by:
Wiggens, Gary, CHEMINFO: Chemical Information Sources, Indiana University, http://www.indiana.edu/~cheminfo
Maizell, Robert E., How to find chemical information: a guide for practicing chemists, educators, and students, 3rd Edition, Wiley, New York, 1997
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