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Recent Developments in Selected Sesquiterpenes: Molecular Rearrangements, Biosynthesis, and Structural Relationship among Congeners

By Shashikumar Paknikar and Kamlesh Pai Fondekar Submitted: October 17th 2017Reviewed: February 6th 2018Published: November 5th 2018 DOI: 10.5772/intechopen.74998 Abstract Recent developments in selected sesquiterpenoids are reviewed for the past one decade (2005–2017) with special reference to Mechanisms of multistep molecular rearrangements of some sesquiterpenes or derivatives based on isotopic labeling studies and extensive spectroscopic […]

Clay minerals as catalysts in organic reactions

Sajo P. Naik Naperville, Illinois, USA spnaik@gmail.com  “The synthetic chemist rarely borrows accessories for the laboratory from the vast stockroom of nature. We resist scooping some dust into a reaction flask. Yet elegant chemistry can be performed if clays are used as supports or catalysts.” -Pierre Laszlo Over the years clay minerals have generated a […]

Everything you could imagine is real

Everything you could imagine is real – Sneha Naik & Savia Torres* Carmel College for Women, Nuvem, Goa*saviaptorres@yahoo.com “Everything you could imagine is real”. These words of Pablo Picasso come true for the T.Y. B.Sc. students of the Department of Chemistry, Carmel College for Women, Nuvem, Goa during the academic year 2013-14. The year turns […]

Reaction of (+)-Maaliol and (-)-Guaiol with Lead Tetraacetate

Shashikumar K. Paknikar 1,2,* and Joydeep Bhattacharjee 1 1Department of Chemistry, Goa University, Goa, 403206, India and Prof. S.C. Bhattacharyya OrganicSynthesis Laboratory, VerGo Pharma, Research, Verna, Goa, 403722, India Abstract- Lead tetraacetate oxidation of (+)-maaliol and (-)-guaiol has led to the production of one trinor-4,5-secoeudesmane and two 4,5-secoeudesmane compounds from maaliol and 1,2-dehydroguaioxide from guaiol. […]

The Importance of Natural Products in medicinal chemistry

Author: Shahuraj H Kadam, Siddarth Apartment A, Sinhagad road, Pune. shahurajk@gmail.com Introduction Medicinal plants and traditional medicine have been used by tribal communities and ancient civilizations for thousands of years. Recent, modern medicine has taken a look back at medicinal plants and herbs for healing. No one knows exactly how many different plants are used […]

Bakul – Flowers & Fragrance by Sampath Venkatanathan

Bakul (Mimusops elengi), champa (Michelia champaka), and parijata (Nychanthes arbotristis) are among the most beautiful and sacred of India’s many exotic flowering trees. They can be dubbed as “Trinity” of divine flowers. Countless souls throughout the ages have lived in the gentle presence of these beneficent beings that give their barks, leaves, roots, seeds, resins, […]

Negro Pepper (Xylopia aethiopica [Dun.] A. Rich.)

Negro Pepper has been used as a pepper substitute in Europe, but with regular imports of black pepper from India starting in the 16th centure, it mostly disappeared. In later times, negro pepper was only traded as a pepper substitute (or surrogate) in times of war and short supply. Complete PDF can be downloaded here

Multi-step rearrangement mechanism for acetyl cedrene to the hydrocarbon follower

Conversion of acetyl cedrene (2) to its follower (3) using acetic anhydride and polyphosphoric acid involves a multi-step cationic molecular rearrangement, which is consistent with deuteriation and 1-13C labeling studies of acetyl cedrene. The key step involves cyclopropylcarbinyl cation-cyclopropylcarbinyl cation rearrangement. The paper can be purchased from this link: https://link.springer.com/article/10.1007/s10600-017-2085-1?no-access=true