(P,M)-1,2,3,9,10,11-Hexamethoxy-5,7-dihydrodibenz[c,e]oxepine and (P,M)-1,11-dimethyl-5,5,7,7-tetraphenyl-5,7-dihydrodibenz[c,e]oxepine

Abstract

The title compounds, C(20)H(24)O(7) and C(40)H(32)O, respectively, are racemic oxepines, the molecules of which contain a chiral axis. Both molecules possess crystallographic C(2) symmetry and the seven-membered ring adopts a twisted-boat conformation.

The Time-resolved and Extreme-conditions XAS (TEXAS) facility at the European Synchrotron Radiation Facility: the energy-dispersive X-ray absorption spectroscopy beamline ID24

“…Different experimental facilities are available for pulsed magnetic field applications: (a) an ESRF-made minicoil (Van der Linden et al, 2008) and (b) the LNCMI coil (Frings et al, 2006), provided through a scientific collaboration with Laboratoire National Champs Magné tiques Intenses (LNCMI, Toulouse, France). The ESRF minicoil system with a stored energy of 4 kJ currently provides peak fields of 30 T for 50 ms at repetitions of up to 5 cycles min À1 , in a sample space of 3 mm diameter with sample temperatures ranging from 4 to 250 K. The absolute uncertainty in field is 4% and pulse-topulse uncertainty is 0.1% at 30 T. Uncertainty in the timing is $ 2 ms.…”

Multi-frame acquisition scheme for efficient energy-dispersive X-ray magnetic circular dichroism in pulsed high magnetic fields at the FeK-edge

“…The magnet is energized through a bipolar thyristor-switched capacitive storage pulsed power supply, commercially available from Metis (http://www.metis.be/). A detailed description of the miniature pulsed magnet system is found by van der Linden et al (2008).…”

6,11-Dihydrodibenz[b,e]oxepin-11-one

“…For comparative NMR and IR spectral, X-ray structural and theoretical studies of eight related 6-arylidenedibenzo [b,e]thiepin-11-one-5,5-dioxides, see: Kolehmainen et al (2007). For related structures, see: Bandoli & Nicolini (1982); Blaton et al (1995); Ieawsuwan et al (2006); Linden et al (2004); Roszak et al (1996);Yoshinari & Konno (2009);Zhang et al (2008Zhang et al ( ,2008a. For DFT calculations, see: Hehre et al (1986); Schmidt & Polik (2007).…”