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Moving primary source citations to talk, to save
The sources being moved are all much too narrow, and / or are commercial, lacking page nos. and relevant dates, or are outdated, etc. They are therefore inadequate / inappropriate for a general introductory chemistry article. Moreover, they are not at all indicative of the enormous secondary literature available on this subject, and are only of value as a peripheral sources (i.e., sources of examples of application). Hence, the current three narrow and flawed references are being removed here, to Talk. This is being done as a respectful option to their simply being deleted. A multiple issue/citation tag is being added for the interim, until the article can be moved into reasonable shape. Inadequate/inappropriate sources appearing in the earlier version of the article (leading < removed):
ref>Microwave-assisted extraction of tea polyphenols and tea caffeine from green tea leaves. Xuejun Pan, Guoguang Niu and Huizhou Liu, Chemical Engineering and Processing, Volume 42, Issue 2, February 2003, Pages 129-133 doi:10.1016/S0255-2701(02)00037-5</ref>
ref name="a">LUQUE, R., CAMPELO, J. and CLARK, J., eds, 2011. Handbook of Biofuels Production - Processes and Technologies. Woodhead Publishing.</ref>