Presents procedures for obtaining and examples of delta plots (a way of illustrating electron density changes associated with electronic excitation). These plots are pedagogically useful for visualizing simple and complex transitions and provide a way of "seeing" the origin of highest occupied molecular orbital (HOMO)-dictated carbonyl…

Discusses the use of additive and substitutive nomenclature for chemical substances rather than classifying substances as organic or inorganic. (MLH)

The chemist plays an important role in perfumery. There are scientific problems involved in relating odour to structure, including analysis of essential oils, quality control, and synthetic chemistry. (DF)

Short articles on the alkylation of aniline, the preparation and properties of perbromate, using scrap copper in chemistry instruction, a safe method of burning hydrogen, and the use of an ion-charge model as an alternative to the mole concept in secondary school instruction. (AL)

Proposes that the concept of neighboring group participation (NGP) be introduced in undergraduate organic chemistry. Discusses the requirements for NGP with respect to electron availability, kinetics, and steric factors. Finally, the author presents the controversy over bridged ions, particularly phenonium ions in the solvolyses of beta-pheylethyl…

Discusses the molecular features common to compounds which taste sweet. Particular emphasis is placed on the hydrogen bonding evident in these chemicals. (TS)

Concerted reactions occur in only one step and thus present special problems in the study of their reaction mechanisms. Concertedness can be established with certainty only from a detailed description of the transition state. (Author/TS)

Describes procedures suitable for student preparation of benzaldehyde, benzoic acid, and ethyl benzoate sequentially from benzyl alcohol. Preparation for benzyl chloride also given. All reagents except benzyl alcohol are common inorganic chemicals. (AL)