2,5-Dimethyl-1,3-dinitrobenzene

Erratum, Vol. 13, February 25 Release

This corrects the article DOI: 10.5888/pcd13.150228.

Dimethyl 2-[22,24-dimethyl-23-oxo-8,11,14-trioxa-25-aza­tetra­cyclo­[19.3.1.02,7.015,20]penta­cosa-2,4,6,15(20),16,18-hexaen-25-yl]but-2-enedioate

The title compound, C(29)H(33)NO(8), is a product of the Michael addition of the cyclic secondary amine subunit of the aza-14-crown-4 ether to dimethyl acetyl-enedicarboxyl-ate. The piperidinone ring exhibits a distorted chair conformation, and the dimethyl ethylenedicarboxylate fragment has a cis configuration with a dihedral angle of 78.96 (5)° between the two carboxyl-ate groups. The crystal...

Carl de Boor Linear Algebra draft 25 jan 13

13:00-13:25 Modeling of aluminum in water treatment process

The need for early fault detection and effective maintenance operations in the industry makes us think about developing tools that that can handle the uncertainty of the processes and improve the maintenance scheduling. Among other decision support tools, Bayesian Networks (BN) is a method that can handle the uncertainty in industrial processes. If we add on-line physical models to this method,...

The crystal structure of meta-dinitrobenzene

The crystal of meta-dinitrobenzene, C6H 4(N 02)2> is orthorhombic pyram idal. The dimensions of the un it cell, which contains 4 molecules, are a = 13-3A, 6 = 14*1 A, c = 3-80A and the space group is Pbn. The m ethod of double Fourier series has been applied, and a projection of the electron density on the ab plane has been made. The plane of the benzene ring of the molecule is inclined a t an ...