Carbonium nomenclature

Extended Hückel Theory. IV. Carbonium Ions

A new nomenclature for fungi

Important changes brought about by the Melbourne International Code of Nomenclature for Algae,FungiandPlantsare briefly reviewed concerning a clarification of the spelling and typification of sanctioned fungal names, the recognition of electronic publication for the validity of nomenclatural novelties, permission to use English diagnoses or descriptions for their valid publication, and the requ...

The Role of Carbonium Ions in Color Reception

It is a fundamental property of conjugated systems to accept a proton or Lewis acid and form a stable carbonium ion. Polyenes that are protonated or add Lewis acids in this manner undergo substantial red shifts. For example, vitamin A(1) acetate absorbs at 350 mmicro in neutral and at 650 mmicro in acidic benzene solution. The fundamental basis for absorption of polyene systems was described in...

Allergen nomenclature.

This article presents a nomenclature system for allergens which has been officially recommended by the International Union of Immunological Societies (IUIS). The nomenclature is based on proposals of the IUIS Sub-Committee for Allergen Nomenclature and is applicable to highly purified, well-characterized allergens and to non-purified or partially purified allergenic extracts.

Identification of Carbonium and Carbenium Ions by QTAIM

A ferramenta de Gassman-Fentiman da demanda crescente de elétrons foi usada para identificar íons carbênios e íons carbônios. Contudo, devido ao seu entendimento ambíguo, ela foi pivô de uma disputa histórica. Nós aplicamos a metodologia da Teoria Quântica de Átomos em Moléculas QTAIM para caracterizar íons carbênios e íons carbônios de uma forma mais eficaz e mais fácil. Essa metodologia pode ...