1-(4-Chloro­benzo­yl)-3-cyclo­hexyl-3-methyl­thio­urea

In the title compound, C15H19ClN2OS, the dihedral angle between the amide and thio­urea fragments is 58.07 (17)°. The cyclo­hexane group adopts a chair conformation and is twisted relative to the thio­urea fragment, forming a dihedral angle of 87.32 (18)°. In the crystal, N—H⋯S hydrogen bond links the mol­ecules into chains running parallel to the a-axis direction

The Key Criteria in Deciding to Tender for Construction Projects

Planning for a construction project is a formidable task which involves a huge investment with multiple stakeholders such as clients, consultants, and contractors. A tender is a submission of a technical, administrative, and contractual material made by a potential contractor in response to an invitation to tender by the project client. Established contractors normally realise the importance of doing initial research before committing themselves to enter the tender. Normally, tender pre-qualification is a strict process. A low-quality tender submitted due to problems such as insufficient time and incomplete tender documents normally lead to tender rejection by the client. Thus, this research aimed to provide a strategy to help the contractors in deciding whether they should or should not submit a tender at the initial tendering decision phase. The literature review was focused on the key factors identified in influencing the decision-making process and in the final part, the initial conceptual model was establishe

6,6′-Dimeth­oxy-2,2′-[(E,E′)-(4-chloro-m-phenyl­ene)bis­(nitrilo­methyl­idyne)]diphenol

The title compound, C22H19ClN2O4, has the appearance of a warped butterfly. One 2-hydr­oxy-3-methoxy­benzyl­idene­amino fragment is planar [with a maximum deviation of 0.056 (3) Å] and forms a dihedral angle of 9.85 (9)° with the central benzene ring. The other fragment is not planar; however, the methoxy­phenol group is planar [with the maximum deviation of 0.033 (2) Å] and makes a dihedral angle of 41.7 (3)° with the central benzene ring. The mol­ecule is stabilized by intra­molecular O—H⋯N hydrogen bonding. The crystal structure is stabilized by weak inter­molecular C—H⋯O hydrogen bonding and C—H⋯π inter­actions

N-Propionylthio­urea

The mol­ecule of the title compound, C4H8N2OS, is essentially planar; it adopts a trans configuration with respect to the position of the propionyl group relative to the thiono S atom about the C—N bond. The mol­ecular structure is stabilized by an intra­molecular N—H⋯O hydrogen bond between the propionyl O atom and the amide H atom. Mol­ecules are linked into a two-dimensional network parallel to the (10) plane by N—H⋯O and N—H⋯S inter­molecular hydrogen bonds

3-Methyl-2-propionamido­butanoic acid

The reaction of propionyl isothio­cyanate with valine was found to give the title compound, C8H15NO3, instead of the expected thio­urea product. The whole mol­ecule is non-planar and the carbonyl group is cis to the methyl­butanoic acid group across the C—N bond. Inter­molecular O—H⋯O and N—H⋯O hydrogen bonds build up a two-dimensional network developing parallel to (100)

N-(2,2-Dimethyl­propano­yl)-N′-(2-meth­oxy­phen­yl)thio­urea

In the title compound, C13H18N2O2S, the carbonyl­thio­urea fragment is nearly planar with an r.m.s. deviation of 0.0096 Å. The dihedral angle between carbonyl­thio­urea group and the benzene ring is 19.16 (16)°. There are two intra­molecular N—H⋯O hydrogen bonds, which lead to two pseudo-six-membered rings. Weak intra­molecular C—H⋯S hydrogen bonding also occurs

N-(4-Chloro­butanoyl)-N′-(2-fluoro­phen­yl)thio­urea

In the title compound, C11H12ClFN2OS, the asymmetric unit consists of two indenpendent mol­ecules. Both mol­ecules maintain a trans–cis configuration of the positions of the butanoyl and fluoro­phenyl groups with respect to the thiono group across their C—N bonds and are stabilized by classical intra­molecular N—H⋯O hydrogen bonds. In the crystal, inter­molecular N—H⋯O, C—H⋯S and N—H⋯S hydrogen bonds link the mol­ecules into infinite chains along the c axis

1,2-Bis[N′-(2,2-dimethyl­propionyl)thio­ureido]cyclo­hexa­ne

In the title compound, C18H32N4O2S2, the dihedral angle between the two thio­urea groups is 78.55 (7)°. The mol­ecular conformation is stabilized by intra­molecular N—H⋯O hydrogen bonds and the crystal structure is stabilized by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds, forming centrosymmetric dimers

1-(4-Chloro­benzo­yl)-3-(3-methyl­pyridin-2-yl)thio­urea

The mol­ecule of the title compound, C14H12ClN3OS, consists of three approximately planar fragments: the central thio­urea group, the chloro­phenyl group and the picolyl (3-methyl­pyridin-2-yl) group with a maximum of 0.035 (2)° for an N atom from the mean square plane of the central thiourea group. The central fragment forms dihedral angles of 33.30 (8) and 76.78 (8)° with the chloro­phenyl and picolyl groups, respectively. With respect to the thio­urea C—N bonds, the 4-chloro­benzoyl group is positioned trans to the thiono S atoms, whereas the picolyl group lies in a cis position to it. The mol­ecular conformation is stabilized by an intra­molecular N—H⋯O hydrogen bond. In the crystal, mol­ecules are linked by inter­molecular C—H⋯N hydrogen bonds, forming chains along the a axis

N-(4-Chloro­benzo­yl)-N′-(3-fluoro­phen­yl)thio­urea

In the title compound, C14H10ClFN2OS, the mol­ecule adopts a trans–cis geometry of the thio­urea unit. The dihedral angles between the benzene rings is 34.47 (7)°. The crystal packing features inter­molecular N—H⋯S and C—H⋯O hydrogen bonds, forming a chain along the b axis. A short C—H⋯S intramolecular contact is also observed