Synthesis of sterically hindered 1-arylpyrrolidines and 1-arylpiperidines by condensation of primary aromatic amines with cyclic ethers or diols

A variety of 1-($\text{o}$-alkylphenyl)- and 1-($\text{o}$-$\text{o}$'-dialkylphenyl)- pyrrolidines and -piperidines were prepared by the gas phase alumina mediated condensation of tetrahydrofuran (THF), tetrahydropyran (THP) or the corresponding diols with primary aromatic amines in fair to high yield. This methodology can also be used for the synthesis of 1-phenylhexahydroazepine from aniline. A mechanistic interpretation of the catalytic action of alumina is presented.     

A computer program system for kinetic analysis of non-isothermal thermogravimetric data: I. Data acquisition and preparation for kinetic analysis

FORTRAN software is described which enables the generation of rate of weight change data (DTG) from percentage weight change measurements (TG), obtained under non-isothermal conditions. The program also transposes this information into the dimensionless extent and rate of reaction at unit temperature intervals by means of a cubic spline interpolation. A simple search routine identifies all DTG spikes in the thermogravimetric record, and the temperature and extent of reaction at which the rate attains its maximum value. This total information serves as input data for the kinetic analysis software to be discussed in part II of this communication. An example of the application of this program to the pyrolysis of bituminous coal is presented.     

Energy ordering of the B and C states in XeCl,XeBr, and KrCl,from temperature dependence of emission spectra

Inert-gas halide emission spectra from a Tesla discharge are studied as a function of pressure and temperature. From the temperature dependence of the infinite pressure ratio of broad-band (C → A and B → A) emission to B → X emission, the energy separations, T_eC - T_eB, are found to be ?130 cm^?1 (XeCl), ?80 cm^?1 (XeBr) and 375 cm^?1 (KrCl). Estimates of the (C → A)/(B → X) spontaneous emission branching ratios agree well with theoretical predictions.     

Quenched! The ISABELLE Saga, II

This is the second part of a two-part article about ISABELLE, a colliding-beam accelerator conceived in 1971, officially approved in 1978, partially constructed, and terminated in 1983. I cover here the period from ISABELLE’s groundbreaking in 1978 to its termination in 1983. I treat the problems with ISABELLE’s superconducting magnets, the steps by which the problems became clear within the laboratory and to the outside, the initial failure of the laboratory administration to take forceful steps, conflicts with Fermilab, the alternate magnet projects, the repeated missing of openings that eventually used up the window of opportunity. I cover Robert Palmer’s successful creation of an alternate magnet that used Brookhaven’s existing tooling and techniques and provided (too late) a technical solution to the project’s problems, and the name change to the Colliding Beam Accelerator (CBA). I also discuss the failure of the machine to hold the physics community’s interest, and the project’s termination.     

Emanation thermal analysis

A high pressure differential thermal analysis (DTA) apparatus is described which is capable of operation in the pressure range up to 500 MPa and at temperatures from 25 to 300°C. The requirements for quantitative DTA are examined. The apparatus enables the determination of heat of transition under high pressure by using small samples.     

Polyhedral cones and positive operators

Some results are obtained relating topological properties of polyhedral cones to algebraic properties of matrices whose columns are the extremal vectors of the cone. In addition, several characterizations of positive operators on polyhedral cones are given.     

A synthesis of (±)-cryptojaponol and (±)-taxodione

A new method for the synthesis of highly substituted catechols involving the decarboxylation of an α,β-epoxyenone was developed and employed in a synthesis of two diterpenes, cryptojaponol and taxodione.