Concerted unimolecular eliminations from ionized sec-alkyl aryl ethers (ROAr (+*)) display a preference for producing double bonds with trans geometry. This preference can be assessed quantitatively, provided that a regioselective variant can be found. Expulsion of neutral alkenes via syn-elimination to give ionized ArOH does not exhibit a pronounced preference with regard to the direction of e...

In the title solvated phosphonium salt, C34H40P(+)·Cl(-)·2CHCl3, the two cyclo-hexyl and two 1-naphthyl-methyl groups at the P atom are in a distorted tetra-hedral arrangement [105.26 (6)-113.35 (6)°]. Both cyclo-hexyl rings adopt a chair conformation. The dihedral angle between the naphthyl ring systems is 74.08 (3)°.

The title compound, C(16)H(25)NO(2)S, is a sulfonamide derivative with the substitution of propyl and cyclo-hexyl groups at the N atom. The least-squares plane through all six C atoms of the cyclo-hexyl ring forms a dihedral angle of 58.88 (12)° with the toluene ring. No hydrogen-bonding inter-actions are present in the crystal structure.

The title organic compound, C(19)H(27)N(3)O(2)·H(2)O, was synthesized from methyl-ene dicyclo-hexyl-amine, 4-pyridine-carboxylic acid and N,N'-dicyclo-hexyl-carbodiimide. The water molecule is involved in inter-molecular hydrogen bonds, linking symmetry-related urea mol-ecules into a two-dimensional supra-molecular ladder-like structure.

The title compound, C(13)H(15)BrClNO, was prepared by the condensation of equimolar quanti-ties of 3-bromo-5-chloro-salicyl-aldehyde with cyclo-hexyl-amine in methanol. There is an intra-molecular O-H⋯N hydrogen bond in the mol-ecule. The cyclo-hexyl ring adopts a chair conformation.

In the title compound, C(15)H(17)FO(3)S, the cyclo-hexyl ring adopts a classic chair conformation and the aryl-sulfonyl unit is positioned equatorial relative to the cyclo-hexyl group. In the crystal, mol-ecules are linked through weak inter-molecular C-H⋯O hydrogen bonds.

By numerical simulation, a bilateral horizontal well is placed in a crude oil reservoir with bottom water. The upper branch which is located near the top of the reservoir is for producing and the lower branch which is located near the oil water contract is for nitrogen foam injecting. Packers are used to control the alternation between productions and injections. When water cut of the upper bra...