18389-56-5

Upstream product

• 109-83-1 (2-hydroxyethyl)(methyl)amine 
• 683-85-2 N,N-dimethylaminodichlorophosphane 
• 1608-26-0 Hexamethylphosphorous triamide 

Downstream Products

• 22550-74-9 2-methoxy-3-methyl-1,3,2-oxazaphospholidine 
• 37521-12-3 5-dimethylamino-2,4-diisopropylidene-9-methyl-1,3,6-trioxa-9-aza-5λ⁵-phospha-spiro[4.4]nonane 
• 29476-28-6 5-dimethylamino-9-methyl-2,3-diphenyl-1,4,6-trioxa-9-aza-5λ⁵-phospha-spiro[4.4]non-2-ene 
• 56642-18-3 5-methoxy-2,6,9-trimethyl-3-phenyl-1,4-dioxa-6,9-diaza-5λ⁵-phospha-spiro[4.4]non-2-ene 
• 56642-23-0 8-acetyl-5-dimethylamino-4,7-dimethyl-9-phenyl-1,6-dioxa-4-aza-5λ⁵-phospha-spiro[4.4]non-7-ene 

Relevant academic research and scientific papers

Complete multinuclear magnetic resonance analysis of heterophospholanes and their sulfur, selenium and borane adducts

1H, 11B, 13C, 15N, 31P and 77Se NMR spectra were obtained for 1,3-(dioxa, oxaza or diaza)-2-phospholanes and their sulfur, selenium and borane adducts. The relative sign of the 3J(1H, 31P)/2/(13C, 31P) coupling constants was found to be positive in the sulfur and selenium adducts for the methylene and methyl groups. Conversely, for the compound with a phosphorus lone pair and in the borane adducts this sign changes for the methylene groups. It was shown that the 31P NMR spectra recorded by the CPMG or INEPT-HEED pulse sequences can be used for observation of the 15N-31P coupling constants. In all the investigated compounds the spin-lattice relaxation of 31P is controlled by the spin-rotation mechanism. The dipole-dipole 31P-11B interactions can provide less than 20% of the relaxation rate in compounds containing the BH3 group. The transverse 31P relaxation is dominated by the scalar contribution. Copyright

Conformation and Stereodynamics of 2-Dialkylamino-1,3-dioxa- and 3-Methyl-1,3-oxaza-2-phospholanes. A Carbon-13 Nuclear Magnetic Resonance and Theoratical MNDO Investigation.

Rotation around the exocyclic P-NR2 bond in the title compounds (R = Me, Et, and i-Pr) has been frozen on the 13C n.m.r. time-scale at -100 to -150 deg C.The exocyclic PNC coupling constants confirm that the preferred conformation has one NR group eclipsing the phosphorus lone pair and the other lying over the face of the ring; this geometry is also supported by MNDO SCF MO calculations.The P-NR2 rotational barriers, which lie in the range 6.0-9.2 kcal/mol, increase in the sequence 1,3-dioxa- 1,3-oxaza- 1,3-diazaphospholane and also with increasing size of the NR group.MNDO calculations of the barrier height reproduce the former sequence.The cyclic POC and PNC coupling constants are discussed in relation to the ring conformation, and some 15N n.m.r. data are reported.