Related Experiment Video
Updated: May 27, 2026

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
3,3'-Diphenyl-1,1'-(butane-1,4-di-yl)dithio-urea
Pramod Pansuriya1, Holger B Friedrich, Glenn E M Maguire
1School of Chemistry, University of KwaZulu-Natal, Durban 4000, South Africa.
Abstract:
The asymmetric unit of the title compound, C(18)H(22)N(4)S(2), contains one half-mol-ecule, the complete mol-ecule being generated by crystallographic inversion symmetry. The crystal structure features two inter-molecular N-H⋯S hydrogen-bonding inter-actions, the first generating an infinite chain along the b axis and the second an infinite chain along the a axis, together forming an inter-locking structure.
Related Concept Videos
Structure of Conjugated Dienes
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
Stability of Conjugated Dienes
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
π Molecular Orbitals of 1,3-Butadiene
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

